cherry, 02 Nov 2016I just bought redmi note 3 few days ago. Today suddenly my phone freeze, press power button bu... morePress the volume up button, volume down button and power button simultaneously until and unless it starts rebooting.
Then phone will restart.
I will recommend you to clean up cache not by inbuilt cleaner but app cache cleaner which is available in play store, it should show the effect

First, we enable developer mode, If you already enable then follow from step 4.
Go to settings ->About Phone.
Continuously tap on MIUI version. A Message appears in the bottom Â“Now you are developerÂ”.
Go to settings -> Additional settings -> Developer optons.
Turn Off Memory optimization.
Restart option appears on Screen. tap on Ok.
After restart. lagging problem solved in your Mi phone.
This lagging problem occurred in Xiaomi phones because of the Memory arrangement in MIUI. But after following above steps your all problems solved. There is no lag issue after that. You donÂ’t face any hanging problem in your Mi phone.

You can also solve this lagging problem via clearing the cache data through the help of security app. one more option you can reset also. Please note Reset is the last option of any problem. DonÂ’t reset your phone in every week. Suppose if you reset then your phone work smoothly for 4-5 days after that same lagging if you donÂ’t clear the cache data. So Memory optimization is the best way to solve your lagging problem in Xiaomi mobiles.

Above solution is work on all MIUI versions. No matter which you are using like MIUI 7 or MIUI 8. Because MIUI gives us more power of customization.